<template>
    <div>
        <!-- 面包屑导航区域 -->
       <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
       </el-breadcrumb>

       <!-- 卡片视图区 -->
       <el-card>
           <!-- 警告区域 -->
           <el-alert title="注意：只允许为第三级分类设置参数！" type="warning"  show-icon> </el-alert>
           <!-- 选择商品分类区域 -->
           <el-row class="goodsCate">
               <el-col>
                   <span>选择商品分类：</span>
                   <!-- 级联选择框 -->
                   <el-cascader
                        v-model="cateKeys"
                        :options="cateList"
                        :props="cateProps "
                        @change="cateChange" clearable>
                    </el-cascader>
               </el-col>
           </el-row>
           <el-tabs v-model="activeName" @tab-click="handleTabClick">
               <!-- 动态参数区域 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini" :disabled="isDisabled" @click="addDialogVisible = true">添加动态参数</el-button>
                    <el-table :data="manyTabData" style="width: 100%">
                        <el-table-column  type="expand">
                            <template slot-scope="scope">
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)"> {{item}}</el-tag>
                                <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)" >+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column label="#" type="index"></el-table-column>
                        <el-table-column  prop="attr_name" label="动态参数名称" > </el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <!-- 修改按钮 -->
                                <el-button type="primary" icon="el-icon-edit" size="mini"  @click="showEditDialog(scope.row.attr_id)">
                                </el-button>
                                <!-- 删除按钮 -->
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeById(scope.row.attr_id)">
                                </el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
               <!-- 静态属性区域 -->
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini" :disabled="isDisabled" @click="addDialogVisible = true">添加静态属性</el-button>
                    <el-table :data="onlyTabData" style="width: 100%">
                        <el-table-column  type="expand">
                            <template slot-scope="scope">
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)"> {{item}}</el-tag>
                                <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)" >+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column label="#" type="index"></el-table-column>
                        <el-table-column  prop="attr_name" label="静态属性名称" > </el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <!-- 修改按钮 -->
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">
                                </el-button>
                                <!-- 删除按钮 -->
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeById(scope.row.attr_id)">
                                </el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
       </el-card>

        <!-- 添加参数或属性的对话框 -->
        <el-dialog :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%" @close="addFormClose">
       
            <el-form ref="addForm_ref" :model="addForm" :rules="addForm_rules" label-width="80px">
        
                <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name" ></el-input>
                </el-form-item>
            </el-form>
          
            <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
         </span>
        </el-dialog>

        <!-- 修改参数或属性的对话框 -->
            <el-dialog :title="'修改'+titleText" :visible.sync="editDialogVisible" width="50%" @close="editFormClose">
        
            <el-form ref="editForm_ref" :model="editForm" :rules="editForm_rules" label-width="80px">
        
                <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name" ></el-input>
                </el-form-item>
            </el-form>
        
            <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
         </span>
        </el-dialog>
    
    </div>
</template>

<script>
export default {
    data() {
        return {
            cateList: [],
            cateProps: {
                expandTrigger: 'hover',
                value: 'cat_id',
                label: 'cat_name',
                children: 'children',
            },
            cateKeys: [],
            activeName: 'many',
            manyTabData: [],
            onlyTabData: [],
            // 添加参数
            addDialogVisible: false,
            addForm_rules:{
                attr_name:[
                    { required: true, message: '请输入名称', trigger: 'blur' },
                ]
            },
            addForm:{
               attr_name:'' 
            },
            // 修改参数
            editDialogVisible: false,
            editForm_rules:{
                attr_name:[
                    { required: true, message: '请输入名称', trigger: 'blur' },
                ]
            },
            editForm:{
                attr_name:'',
                attr_id:0
            },
            inputVisible:false,
            inputValue:'',

        }
    },

    created() {
        this.getCateList()
    },

    methods: {
        // 获取分类列表
        async getCateList(){
            const {data:res} = await this.$http.get('categories');
            if (res.meta.status !== 200) {return this.$message.error('获取商品分类失败')};
            this.cateList = res.data;
        },
        // 监听级联选择器的改变
        cateChange() {
            this.getParams();
        },
        // tab标签改变
        handleTabClick() {
            this.getParams();
        },
        // 获取参数
        async getParams(){
            if (this.cateKeys.length !== 3) {
                this.cateKeys = [];
                this.manyTabData = [];
                this.onlyTabData = [];
                return;
            };
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{
                sel:this.activeName
            }});
            res.data.forEach(item =>{
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                // 控制input的隐藏
                item.inputVisible = false
                // 保存input中的数据
                item.inputValue = ''})
            // console.log(res);
            if(this.activeName === 'many'){
                this.manyTabData = res.data;
            }else{
                this.onlyTabData = res.data;
            }
        },
        // 添加参数
        addFormClose(){
            this.$refs.addForm_ref.resetFields();
        },
        addParams(){
            this.$refs.addForm_ref.validate(async valid =>{
                if (!valid) return;
                const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                });
                // console.log(res);
                if (res.meta.status !== 201){return this.$message.error('添加参数失败')};
                this.$message.success('添加参数成功');
                this.addDialogVisible = false;
                this.getParams();
            })
        },
        // 获取需要修改参数
        async showEditDialog(attr_id){
            const {data:res} =await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{params:{
                attr_sel: this.activeName
            }})
            this.editForm.attr_name = res.data.attr_name;
            this.editForm.attr_id = res.data.attr_id;
            // console.log(this.editForm);
            this.editDialogVisible = true;
        },
        editFormClose(){
            this.$refs.editForm_ref.resetFields();
        },
        // 修改参数
        editParams(){
            this.$refs.editForm_ref.validate(async valid => {
               if (!valid) return;
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                    attr_name: this.editForm.attr_name,
                    attr_sel: this.activeName
                    });
                    // console.log(res);
                if (res.meta.status !== 200){return this.$message.error('修改参数失败')};
                this.$message.success('修改参数成功');
                this.editDialogVisible = false;
                this.getParams();
            })
        },
        // 删除参数
        async removeById(attr_id){
            const confirmRes =await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(error => error);
            if (confirmRes !== 'confirm'){return this.$message.info('已取消删除参数')};
            const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`);
            if (res.meta.status !== 200){return this.$message.error('删除参数失败')};
                this.$message.success('删除参数成功');
                this.getParams();
        },
        handleInputConfirm(row){
            if (row.inputValue.trim().length === 0 ){
                row.inputValue = '';
                row.inputVisible = false;
                return
            };
            row.attr_vals.push(row.inputValue.trim());
            row.inputValue = '';
            row.inputVisible = false;
            this.saveAttrs(row);
        },
        showInput(row){
            row.inputVisible = true;
            // 页面被重新渲染后，获取input的焦点
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        // 将修改后的参数保存到数据库中
        async saveAttrs(row){
           const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name: row.attr_name,
                attr_sel: this.activeName,
                attr_vals: row.attr_vals.join(' ')
                });
                // console.log(res);
            if (res.meta.status !== 200){return this.$message.error('更新失败')};
            this.$message.success('更新成功');
             
        },
        handleClose(i, row){
            row.attr_vals.splice(i,1);
            this.saveAttrs(row);
        }
    },
    computed:{
        // 控制添加参数/或属性的按钮是否禁用
        isDisabled() {
            if (this.cateKeys.length !== 3){
                return true;
            }else{
                return false;
            }
        },
        // 获取被选中分类的ID
        cateId(){
            if (this.cateKeys.length === 3){
                return this.cateKeys[2];
            }else{
                return null;
            }
        },
        // 计算添加参数或属性的对话框的title
        titleText(){
            if (this.activeName === 'many'){
                return '动态参数'
            }else{
                return '静态属性'
            }
        }
    }
}
</script>

<style lang="less" scoped>
.goodsCate{
    margin: 15px 0;
}
.el-tag{
    margin: 0 10px;
}

.input-new-tag{
    width: 120px;
}
</style>